Taka-sama
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
First of all, I know I don't have to try that hard.
There is also a possibility that the current state of affairs has disappeared at a level where one mother can bear... the son is an outlet for uneasy feelings, an outlet for complaints and dissatisfaction that isn't going well, an outlet for anxiety about the future, etc.
One of the causes of the son's sudden change may be due to “unhappiness towards oneself that does not meet the mother's expectations and wishes.” There is a high possibility that anger or sadness towards oneself does not go directly to oneself, but first leads to the destruction of what is important to oneself and what one protects, and then indirectly leads to a desire to destroy oneself.
I also recommend that you try keeping a little distance here. I know that it is necessary to make careful judgments, as my son's acts escalate as it is, and if they only collide with each other's emotions, a real tragedy may eventually occur.
Even if you just shut up and put up with it and watch, no matter what kind of reaction it is, it's conceivable that it will only backlash against my current son.
For example, if you have even a little time to spare, you may be able to make them understand your mother's “gratitude” so far by traveling alone, living alone, living in a dormitory, or working part-time, etc., and anyway, I think it's necessary to make my son “independent” even a little bit so that he can take care of himself as much as possible, and set up opportunities to learn even a little bit about what society is like I know it.
Also, if it is determined that the situation can no longer be helped, consultation and cooperation with a third party organization will also be necessary, as Mr. Mitsumi also said. I know that there are various points of contact with schools/child counseling centers, civic nurseries, or various NPO organizations working on family issues, or the police or lawyers, so please feel free to contact us.
I pray that they will be able to overcome it safely and that they will be able to return to their original peaceful and friendly relationship.
Kawaguchi Hidetoshi Gassho